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Recap guide

Recap the Macintosh Color Classic

Color Classic electrolytics are a common problem, and the analog board also burns certain resistors and zener diodes.

Open the interactive checklist Tick off each capacitor as you replace it. It saves in your browser.

Worth a recap. Reports say it is a common and useful fix on this machine.

Which board do I have?

Boards changed during production. These notes come from the linked sources, and many are only partly documented, so check the board in front of you.

  • Color Classic analog board (Low confidence). How to tell: Board includes DL21 and DL22 18V zeners in parallel. Capacitors: No cap list in the thread. Capacitor list differs from other revisions: not known. Source
  • LC 575 analog board 630-0355 (Low confidence). How to tell: Board number 630-0355. Capacitors: Very similar to Color Classic; some revisions may differ in polarity. Capacitor list differs from other revisions: no. Source

Where to start

Clues from write-ups and forum threads, not a diagnosis. Low confidence means one thread or one repair; high means several write-ups agree.

  • Parts that burn besides caps (Medium confidence). One thread documents analog board parts RL62, RF11 and the DL21/DL22 zeners burning as well, and is worth reading before the recap. Source
  • Analog board photo guide (Low confidence). A photo guide for the similar LC 575 analog board comes with a user-added CSV of all the caps. Source

Tips, tales and maybes

Found in write-ups and forum threads. These are other people's reports, not tested by us. Check part references and values against your own board.

  • Watch out: Solder shavings and parallel zeners (Medium confidence). A Color Classic troubleshooting thread found solder shavings bridging transistor pins (IP11) killed a board whose other parts were fine, and criticises the two 18V zeners DL21 and DL22 in parallel because current concentrates in one. Symptoms listed were an hourglass picture, no display with soft power working and a chirp about three times a second. Source
  • Tip: Measure B+ after the recap (Low confidence). The thread gives reference readings of about 11.6V on 12V and 4.9V on 5V as acceptable and about 60V B+ under load at the horizontal output center pin. Source
  • Watch out: Polarity differs by board revision (Medium confidence). In the LC 575 analog board guide (a near twin of the Color Classic board, 630-0355) CP14, a 1000uF 16V cap, was found facing opposite ways on Rev 1 and Rev A5 boards, so follow your own board's markings. White Rifa film caps there frequently crack and should be replaced. Source
  • Maybe: Why Color Classic boards leak badly (Low confidence). A tag page snippet says Color Classic analog boards suffer from leaking caps because of a single-sided FR-1 board with very thin copper. A separate thread title describes a Color Classic analog board that ticked with fluctuating voltages after a recap, so the recap itself can expose other faults. Source

Before you start

  • Boards changed during production. Check your board number against the guides before you order parts.
  • A tube and its high-voltage circuit can hold a lethal charge. Do not open the tube, and leave the analog board to a professional.

Guides we used

This page and the interactive bench are built from these. They have the photos and the full detail, so please read them and support their authors.

The capacitor list

We have not checked a capacitor list for this machine yet, so none is shown. Follow the guide above for your board, then add the capacitors in the interactive checklist and it builds a shopping list for you.

Skip the sourcing

While you are in there

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Steps, tools and safety

The steps, the tools in top, middle and budget picks, and the safety list are the same for every machine, so they live on one page: How to recap, step by step.

Values are shown as published in the guides above, and boards changed during production. Check the board in front of you. A recap involves hot tools and, on some machines, dangerous voltages. You do it at your own risk.

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